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March 30 1926 a. DEWEY ET AL v METHOD OF CONDITIONING CAN COVERS FOR SEALING Filed Feb. 17, 1925 2 Sheets-Sheet 1 EraLcZZey flewey T/wodo F6 Il /aller- March 30 1926.

B. DEW EY ET AL METHOD OF CONDITIONING CAN COVERS FOR SEALING 17 1:06 7 ate r3: B7" flewey T7w0dore I: MLZLer.

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I Filed. Feb. 17, 1925 Patented Mar. 30, 1926.

UNITED, STATES PATIENT OFFICE.

BRADLEY DEWEY, OE CAKBBIDGE, HABSACHUSETTB, AND THEODORE '1. MILLER, OE

ORANGE, NEW JERSEY, ASSIGNOES 1'0 DEWEY & m CHEMICAL COMPANY, OF-

OAIIBBIDGE, IASSLOHUBET'I'S, A CORPORATION OE HASSACEUBE'ITI.

METHOD OI CONDITIONING CAN COVERS I'OBBEALING.

Application am February 17 1025. mm 16. am.

To all whom it may concern: v

Be it known that we, BRADLEY DEWEY and Tnnononn T. MILLER, both citizens of the United States of America, and residents of Cambridge and Orange, in the counties of Middlesex and Essex and States of Massa chusetts and New Jersey, respectively, have invented new and useful Improvements in.

Methods of Conditioning Can Covers for Sealing, of which the following is a specification.

In the case of the sanitary or open top metal cans one of the most common methods of making them air-tight is by double seaming the can cover and body. This operation is ordinaril accomplished by spinning the periphera edge of the can cover and a comparatively small flange formed on the can body into a double seam. However, before the double seaming operation is performed lining material is-deposited over the sealing area of the cover so that after the operation this lining material cooperates with the double seam for effecting an airtight joint thus preventing the contents of the can from spoiling or deteriorating.

Heretofore in practice it has been customary first to crimp or curl the peripheral edge of the can covers, apply the lining material under the curled flange, and thereafter dry the lining material to form a gasket. While this practice is possible with rubber latex.

T order to hasten the evaporation of the water there results sufiicient steam to form a blister in the film. This blister then breaks withvolcanic effect and in breaking spatter-s compound and e ults in an un ight y P- P e an e, I

Objects of this invention are therefore to overcome the above difliculties and to produce a method for conditioning can covers for sealing having the novel arrangement of steps hereinafter described.

The invention consists of a novel method for conditioning can covers for sealing which generally comprises the following.

succession of steps; first depositing liquid lining material on the covers before said covers have been completely curled, drying the material on the cover, and finally crimping the peripheral edge of the cover preparatory to the sealing operation. If desired, between the de ositing and drying steps the lining materia may be uniformly spreadover the sealing area. An outstanding feature of the above method is that the lining material on the covers'is dried (either completely or in substantial degree) before the peripheral edges thereof are curled. During the drying operation therefore, the lining material is not pocketed or trapped under curled edges and the exposed'area of the material is more extensive (relative to the volume of the material) whereby the material may be. more rapidly dried at higher temperatures without blistering or spattering. For purposes of illustrating the invention an apparatus is shown on the accompanying drawings in which:

Fig. 1 is a side elevation of an apparatus for applying lining material to covers, together with an apparatus for redistributing the material over the covers, and a part of an apparatus for drying the material on the covers;

Fig. 2 is a section on the line 22 of Fig. 1;

Fig. 3 is a section on the line 33 of Fig. 1;

Fig. 4 is a side elevation of an apparatus for drying the lining material on the covers;

Fig. 5 is an end elevationof the apparatus 7 shown in Fig. 4;

6 is a section on the line 6-6 of Fig. 7 is a top plan view on a reduced s a e of a drymg app ratus;

' Fig. 8 is a top plan view of an apparatus for curling the peripheral edges of the cover; a

Fig. 9.is a plan view of a cover;

Fig. 10 is a section on the line 10-10 of p I fixed to the scraper roll 6 atthe end oppo- Fi 9; and i 11 is" a view-similar to F1g.-10 showin the edge of the cover curled;

%he can covers X are in the form of annular disks .provided with a peripheral flange Y and an annular shoulderY. defining therebetween an annular groove Z into which the lining material is scraped. The liquid lining material or sealing compound for the covers is preferably in the form of a viscous and plastic liquid.

An illustrative embodiment of the nvention comprises an apparatus A for applying equal quantities of liquid lining material to each can cover X, and for distributing the material circumferentially of the cover.

After the lining material has been distributed circumferentially over the covers, they are then conducted past a redistributor B which redistributes or spreads the material evenly over the sealing area. Although the the accumulation of an excess amount thereon, which would form a streaked and .uneven coating. For drivin the rolls, a pulley 7 is fixed to one end the applying roll 4 and a pulley 8- larger than the pulley 7 is site from the pulley 7; A driving shaft 9 mounted on suitable brackets beneath the lining material is spread evenly over, the covers X in the form for sealing ii; is still in a liquid state and before curling the peri- 'pheral flange Y preparatory to applying the covers to the cans it is desirable to dry the material thus eliminating liability of displacement of the liquid from the sealing area. For this purpose, the covers-are conducted to a heated drier C where they are continuously rotated for a predetermined length of time until the sealing material is thoroughly dry, and then the peripheral flange on the covers 'is'turned or curled by an apparatus D preparatory to applying the covers to the cans. V

Referring more particularly to the drawings the apparatus A for applying the lining material to the covers comprises a flat support 1 having. legs 2 upon which rests an elongate rectangular pan 3 containing the liquid lining material. An applying roll 4 is supported in the brackets 5 on thesupport 1 and dips-into the bath of the lining material which adheres to the roll, thereby forming a coating over its entire length. In

' order to maintain the coatinguniform in ill thickness, a scraper roll is spaced therefrom aslight distance for example, approximately thirteen-thousandths of an inch.) It

will be observed that the scraper roll 6 is smaller than the'applying roll and is supported above the bath of sealing liquid.

preferably the scraping roll being driven considerably slower than the applying rolland the latter dipping into the'bath andy bringing upa relatively thick coat of the liquid while the scraper roll smoothes the liquid coat en the applying roll and prevents legs 2 is connected to rotate the pulleys 7 and 8 by belts 10 and 11 respectively which pass around pulleysfixed to the shaft, and the driving shaft maybe driven from any suitable source of power applied to the pulley 12. I I

The can covers X arerolled along the a plying roll on the face opposite from t e scraper rollat a sutficient angle for the lining material to flow or be scraped onthe covers in the annular groove Z and for this purpose an endless cable 13 of rubber passes around a sheave 14 which is fixed to a shaft 14 mounted on one end of the support 1 and extends substantially parallel with-the roll 6, together with the endless cable 13 are driven. T helower edges of the covers X are supported on a guide 21 whichextends parallel .to the applying roll 4 and is mounted in close juxtaposition thereto.

In order to insure uniform distribution of the sealing material circumferentially of the cover X and proper spreading transversely of the groove Z in the cover, an elongate nozzle 22 is provided with a slot extending substantially its entire length through which airmay be forced. The'covers X are conducted from the guide 21 to a guide 23 by g the cable 13 so that the upper part of the groove Z lies beneath the slot inthe nozzle The arrangement is such that the air blowing through the nozzleis split by the peripheral flange of the cover, and as the cover is rolled along the air impinges against the sealing liquid and spreads it over the groove Z and a part or the whole of the pcripheral flange Y, as indicated in Fig. 10.

For the purpose of drying the sealing liquid on the covers a drier 'C is provided adjacent the redistributor B and the covers X with the lining material applied thereto The rolls are rotated in the same direction,

riod until the sealing material is thoroughly drv The drier Q comprises a metal casing hay,

' which fuel such as combustible gas may be all '- terior.

' The length of time required ingside walls 24, bottom 25, and rounded and walls 26, and a lining 27 of asbestos board or the like is spacedfrom the'inner walls thereof, the s ace between the casing and housing being, lled with an insulating filler 29 so that the interior of the drier is thoroughly insulated from the surrounding atmosphere. The drier is provided with a detachable cover 28 to afford access to its in- Supports 30 are mounted adjacent opposite ends of the metal casing for holding the drier in substantially a horizontal position. Extending horizontally within the ousing adjacent the bottom thereof is a heater 31 in the form of an elongate nozzle having a plurality of openings through passed thereby heating the interior.

The covers X' are introduced into the drier C through an opening 32 at one side 'near the bottom thereof and an endless cable 33 is provided for rolling the covers around the inside of the housing 27 progressively upward until finally dischar ed at the top. to carry the covers through the housing is predetermined so that when discharged the lining material has dried. The cable 33 passes around alternatel one of the sheaves 34 at one end of the ousing and one of the sheaves 35 at the other end of the housing, the sheaves )weing mounted in staggered relation and the cable assing through an opening 36 adjacent t e top of the drier for dischargmg the covers. mounted upon vertical shafts 37 suitably supported at opposite ends of the casing and in order to guide the covers X a spiral track 38 of an 1e iron is provided along the ath of the ca le 33 although disposed beow and at one side thereof so that the edgeof the covers rests on the track as they are rolled along, as indicated in Fig. 6. From the discharge opening 36 the cable 33 asses around a sheave 39, thence over a. s eave 40, thence over a. sheave 41 having the weight 42 to maintain the cable taut. and thence around a sheave 43 from which it extends into the drier through the opening 32. The sheaves and 43 are mounted on a common shaft 43 supported on the uprights 44 which also serve to support the sheave 39, and in order to drive the cable 33, a drive pulley 45 which may be connected to a suitable source of power is mounted on a shaft 46 to which is fixed a gear 47, meshing with a gear 48'on the shaft 43'. The usual idler pulley 49 may be provided adjacent the drive pulley 45 if desired.

Before performing the double seaming op-- ly conveyed from one step to the next. said steps consisting in applying liquid lining eration hereinbefore mentioned in order to secure the covers X to the can bodies, the upstanding peripheral flanges Y are curled over and an apparatus D for .performmg The sheaves 34 and 35 arethis operation (Fig. -8) comprises a circular disc having a bevelled per1phery 50 suitably mounted-and driven from the pulley- 51. The covers X are fed to the of the disc 50 over a slide 52 an eriphe i d the di s ii 50 which is rotated at a relatively hi l1 rate of speed forces the covers around t e circular guide 53 into a discharge guide 54. e led periphery of the spinning disc The bev 50 engages the peripheray flange Y of the covers andcurls it over as shown in Fig. 11 so that the covers are now ready to be applied to the can body. This curling operation does not displace the lining material because the latter is thoroughly dry and adheres to the metal of the cover.

Without further analysis,-the foregoing will so'fully reveal the gist of this invention that others can by applying current knowledge readily adapt it for various applications without omitting certain features that from the standpoint of the prior art, fairly constitute essential characteristics ofv the generic or specific aspects of this invenapplying liquid lining material to the cover in the form for sealing, drying the material on the covers, and thereafter curling the peripheral edge of the cover preparatory to sealing.

2. The method of conditioning a can cover for sealing which consists in successively propelling the can cover along a predetermined path, depositing liquid lining mate-- rial on the cover in the form for sealing, drying the lining material on the cover, and thereafter curling the peripheral edge. of the cover preparatory to sealing.

3. The method of conditioning a can cover .for sealing which consists in successively depositing litf uid lining material on the I cover in the orm for sealing, distributing the material over the cover in a uniform manner, drying the material on the cover. and thereafter curling the peripheral edge preparatory to sealing. 1

4. The method of conditioning a can cover for sealing in which the cover is successive- 1y. conveyed from one step to the next, said steps consisting in applying liquid lining material to the cover, drying the material on the cover, and finally curling the peripheral edge of the cover. a

5. The method of conditioning a can cover for sealing in which thc'cover is successivematerial to the cover, redistributing the material on the cover in the fo m for sealing, dryin? 1 finally cur cover. Y

6. The method of conditioning a can cover for sealing which consists in continuously moving the cover in a predetermined path 'and during its movement successively applying liquid lining material, redistributing the peripheral edge of the the material on the cover; and said material in the form fo'osealin ed e thereof.

. v n g, mg the nmtermhnnd cnrhng the penphernl l0 igned ,1) ns aflCambridg e, Mass. this 11th day 0 February 1925.

BRADLEY DEWEY. THEODORE T. MILLER, 

